c status 20
c --eliminateinit=1
c --eliminateocclim=0
c --phase=0
p cnf 21 25
8 -9 0
-7 -8 0
2 -1 0
7 -6 1 0
-2 -3 0
-4 6 0
-12 5 0
6 -12 0
10 8 2 0
12 11 0
3 1 0
4 7 0
7 3 0
20 -14 0
15 16 0
-18 -11 0
-10 13 0
-1 -5 9 0
-1 -17 0
16 -15 0
19 3 0
18 -20 0
-13 9 0
-16 17 0
14 21 0